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Updated: Aug 20, 2026

Pre-clinical Evaluation of Tyrosine Kinase Inhibitors for Treatment of Acute Leukemia
Published on: September 18, 2013
Structure of tyroscherin, an antitumor antibiotic against IGF-1-dependent cells from Pseudallescheria sp
Yoichi Hayakawa1, Tomoki Yamashita, Toshiya Mori
1Faculty of Pharmaceutical Sciences, Tokyo University of Science, 2461, Yamazaki, Noda-shi, Chiba 278-8510, Japan. hykw@rs.noda.tus.ac.jp
Abstract:
An antitumor antibiotic, tyroscherin, was isolated from the culture of a fungus identified as Pseudallescheria sp. The structure of tyroscherin including the absolute stereochemistry was determined as shown in Fig. 1 by NMR and degradation studies. Tyroscherin selectively inhibited IGF-1-dependent growth of MCF-7 human breast cancer cells with an IC50 of 9.7 ng/ml.
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